402224456666021 has 4 divisors (see below), whose sum is σ = 438790316362944. Its totient is φ = 365658596969100.

The previous prime is 402224456665987. The next prime is 402224456666101. The reversal of 402224456666021 is 120666654422204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402224456666021 - 2²⁶ = 402224389557157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402224456666321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18282929848445 + ... + 18282929848466.

It is an arithmetic number, because the mean of its divisors is an integer number (109697579090736).

Almost surely, 2^{402224456666021} is an apocalyptic number.

It is an amenable number.

402224456666021 is a deficient number, since it is larger than the sum of its proper divisors (36565859696923).

402224456666021 is a wasteful number, since it uses less digits than its factorization.

402224456666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36565859696922.

The product of its (nonzero) digits is 6635520, while the sum is 50.

The spelling of 402224456666021 in words is "four hundred two trillion, two hundred twenty-four billion, four hundred fifty-six million, six hundred sixty-six thousand, twenty-one".